An inductance editing type 12-slot half-twelve-phase fault-tolerant motor and fault-tolerant method

Abstract

The present invention discloses an inductance-edited 12-slot semi-twelve-phase fault-tolerant motor and a fault-tolerant method. The motor is divided into a fault-tolerant section one, an armature section and a fault-tolerant section two along the axial direction. The armature section is a semi-twelve-phase stator-rotor motor unit, and the fault-tolerant section is a three-phase stator motor unit. All motor units share a rotating shaft, and a set of windings are wound on the stators of the armature section and the fault-tolerant section at the same time. The ABC phase windings are wound in series on the armature section and the fault-tolerant section one, and the UVW phase windings are wound in series on the armature section and the fault-tolerant section two. The fault-tolerant method includes: when a short-circuit fault occurs in a phase winding coil, the electrical connection between the faulty phase winding coil and the controller is disconnected, and the current operating point of the healthy phase is reconstructed to achieve the smooth output of torque while suppressing the short-circuit current. The present invention solves the problem of the existing lack of fault-tolerant technology for semi-twelve-phase motors that takes into account both suppressing short-circuit current and improving the output quality of motor torque.

Description

Technical Field

[0001] The invention belongs to the field of motor fault tolerance, and in particular relates to an inductance editing type 12-slot half-twelve-phase fault-tolerant motor and a fault-tolerant method. Background Art

[0002] Semi-twelve-phase permanent magnet synchronous motors have many advantages such as high reliability, strong fault tolerance, and good torque characteristics. They have broad application prospects in key fields such as electric vehicles, aerospace, and deep-sea exploration. As a common form of winding fault, motor winding short circuit will generate large winding short-circuit current and electrical density, increase winding temperature, and in severe cases, burn winding insulation and damage the motor structure. The short-circuit current will also bring additional torque fluctuations to the motor. The above consequences have brought great harm to the operation of the semi-twelve-phase motor system. Therefore, it is of great significance to study the fault tolerance technology of the semi-twelve-phase motor for winding short circuit. Some scholars use the method of increasing the number of series turns of the winding and reducing the number of parallel windings to increase the inductive reactance of the winding, thereby suppressing the short-circuit current. However, this method does not change the magnetic flux linked by the single-turn coil when it fails, and has limited ability to suppress the short-circuit current of the winding and the short-circuit electrical density in the faulty winding.

[0003] At present, there is a lack of semi-twelve-phase fault-tolerant motors that can suppress short-circuit current by means of winding flux regulation, and there is also a lack of semi-twelve-phase motor fault-tolerant technology that can take into account both suppressing short-circuit current and improving the quality of motor torque output. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes an inductance-edited 12-slot half-twelve-phase fault-tolerant motor and a fault-tolerant method to solve the problem of the lack of existing half-twelve-phase motor fault-tolerant technology that can both suppress short-circuit current and improve motor torque output quality.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] An inductance editing type 12-slot half-twelve-phase fault-tolerant motor, comprising: a winding, a rotating shaft, a fault-tolerant section 1 distributed along the axial direction, an armature section and a fault-tolerant section 2;

[0007] The armature section is a semi-twelve-phase stator-rotor motor unit, and the fault-tolerant section is a three-phase stator motor unit; all motor units share a rotating shaft, and a set of windings are simultaneously wound on the stators of the armature section and the fault-tolerant section; wherein the ABC phase windings are wound in series on the armature section and the fault-tolerant section one, and the UVW phase windings are wound in series on the armature section and the fault-tolerant section two.

[0008] Preferably, the armature segment comprises: an armature segment stator core and a rotor, a radial air gap exists between the armature segment stator core and the rotor, 12 armature segment stator slots are arranged on the inner circular surface of the armature segment stator core, each phase winding is arranged in double layers in the armature segment stator slots, the winding span is 1, and an armature segment winding isolator is arranged between the 2 layers of windings.

[0009] Preferably, the rotor comprises: a rotor core and a permanent magnet, and adopts a surface mounted magnetic pole structure and a built-in magnetic pole structure.

[0010] Preferably, the fault-tolerant segment 1 includes: a fault-tolerant segment stator core and a fault-tolerant segment 1 winding isolator. Six fault-tolerant segment stator slots are arranged on the inner circle surface of the fault-tolerant segment stator core, and each fault-tolerant segment stator slot corresponds to the position of two armature segment stator slots. The winding is arranged in a double layer along the tangential direction in the fault-tolerant segment stator slots, and a fault-tolerant segment 1 winding isolator is arranged between the two layers of windings.

[0011] Preferably, the fault-tolerant segment stator core includes: a yoke, a tooth top, a tooth body and a slot air gap of the fault-tolerant segment stator core, the yoke of the fault-tolerant segment stator core is provided with 6 fault-tolerant segment stator slots along the circumferential direction, thereby forming 6 fault-tolerant segment stator teeth, the fault-tolerant segment stator teeth have tooth tops and a tooth body, and the gap between two adjacent fault-tolerant segment stator teeth is a slot air gap.

[0012] Preferably, the fault-tolerant section two includes: a fault-tolerant section two stator core and a fault-tolerant section two winding isolator. Six fault-tolerant section two stator slots are arranged on the inner circular surface of the fault-tolerant section two stator core, and each fault-tolerant section two stator slot corresponds to the position of two armature section stator slots. The winding is arranged in a double layer along the tangential direction in the fault-tolerant section two stator slots, and a fault-tolerant section two winding isolator is arranged between the two layers of windings.

[0013] Preferably, the fault-tolerant stator core of section two includes: a yoke, a tooth top, a tooth body and a slot air gap of the fault-tolerant stator core of section two, the yoke of the fault-tolerant stator core of section two is provided with 6 fault-tolerant stator slots along the circumferential direction, thereby forming 6 fault-tolerant stator teeth of section two, the fault-tolerant stator teeth of section two have tooth tops and tooth bodies, and the gap between two adjacent fault-tolerant stator teeth of section two is a slot air gap.

[0014] Preferably, the rotor of the fault-tolerant motor includes a 10-pole and 14-pole structure and the permanent magnet flux generated by the rotor poles has a low harmonic content, and the harmonic content of the no-load back electromotive force is less than 4%.

[0015] The present invention also provides a fault-tolerant method for an inductance-edited 12-slot semi-twelve-phase fault-tolerant motor, which is implemented based on the inductance-edited 12-slot semi-twelve-phase fault-tolerant motor, and includes the following steps:

[0016] When a short-circuit fault occurs in the k-th winding coil of the i-phase winding of the motor, the healthy phase current is reconstructed according to the preset principle to perform short-circuit fault tolerance.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The motor of the present invention is divided into a fault-tolerant section one, an armature section and a fault-tolerant section two along the axial direction, wherein the armature section is a semi-twelve-phase stator-rotor motor unit, and the fault-tolerant section is a three-phase stator motor unit; all motor units share a rotating shaft, and a set of windings are simultaneously wound on the stators of the armature section and the fault-tolerant section; wherein the ABC phase windings are wound in series on the armature section and the fault-tolerant section one, and the UVW phase windings are wound in series on the armature section and the fault-tolerant section two. The present invention also proposes a method for reconstructing a current operating point, which disconnects the electrical connection between the faulty phase winding and the controller when a short-circuit fault occurs in a single-phase winding coil, reconstructs the current operating point of the healthy phase, and realizes the smooth output of torque while suppressing the short-circuit current. The present invention solves the problem of the existing lack of a semi-twelve-phase motor fault-tolerant technology that takes into account both suppressing the short-circuit current and improving the motor torque output quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the magnetic flux structure of a motor winding according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic structural diagram of an inductance-edited 12-slot semi-twelve-phase permanent magnet synchronous motor according to an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the armature segment of a motor according to an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of a motor fault-tolerant section 1 according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the motor fault-tolerant section 2 according to an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of a magnetic flux path of a fault-tolerant section of a motor according to an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of the magnetic flux path of the second fault-tolerant section of a motor according to an embodiment of the present invention;

[0027] Figure 8 is a motor current waveform diagram according to an embodiment of the present invention, wherein Figure 8 (a) is the current waveform of the healthy phase when the A1 winding coil is short-circuited and not fault-tolerant. Figure 8(b) is the current waveform of the healthy phase when the A1 winding coil is short-circuited and fault-tolerant;

[0028] Fig. 9 A back electromotive force waveform diagram of a short-circuited winding of a motor under a non-fault-tolerant working condition and a fault-tolerant working condition according to an embodiment of the present invention;

[0029] Fig.10 A current waveform diagram of a short-circuited winding of a motor under a non-fault-tolerant working condition and a fault-tolerant working condition according to an embodiment of the present invention;

[0030] Fig.11 The torque waveform diagram of the motor according to the embodiment of the present invention under the non-fault-tolerant working condition, fault-tolerant working condition and normal working condition of one-phase short circuit;

[0031] Description of the accompanying drawings: 1. armature section stator slot; 2. armature section stator core; 3. winding; 4. rotating shaft; 5. rotor; 6. fault-tolerant section one winding spacer; 7. fault-tolerant section one stator core; 8. fault-tolerant section stator slot; 9. fault-tolerant section two winding spacer; 10. fault-tolerant section two stator core; 11. fault-tolerant section two stator slot; 12. armature section winding spacer; 5-1. rotor core; 5-2. permanent magnet; 7-1. yoke of fault-tolerant section stator core; 7-2. tooth top; 7-3. tooth body; 7-4. slot air gap; 10-1. yoke of fault-tolerant section two stator core; 10-2. tooth top; 10-3. tooth body; 10-4. slot air gap. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Embodiment 1

[0035] Combine the following Figures 1 to 7 This embodiment is described. The inductance editing type 12-slot half-twelve-phase fault-tolerant motor described in this embodiment includes a winding 3 and a rotating shaft 4;

[0036] The motor is divided into a fault-tolerant section 1, an armature section and a fault-tolerant section 2 along the axial direction. The armature section is a semi-twelve-phase stator-rotor motor unit, and the fault-tolerant section is a three-phase stator motor unit. All motor units share a rotating shaft 4, and a set of windings 3 are wound on the stators of the armature section and the fault-tolerant section at the same time. The windings of each phase of the armature section and the fault-tolerant section are distributed in the same phase sequence. Specifically, the armature section winding and the fault-tolerant section winding are the same set of windings 3 and are wound in series between the armature section and a fault-tolerant section in the same phase sequence. Among them, the ABC phase windings are wound in series on the armature section and the fault-tolerant section 1, and the UVW phase windings are wound in series on the armature section and the fault-tolerant section 2.

[0037] In this embodiment, the armature segment includes an armature segment stator core 2 and a rotor 5. There is a radial air gap between the armature segment stator core 2 and the rotor 5. Twelve armature segment stator slots 1 are arranged on the inner circular surface of the armature segment stator core 2. Each phase winding is arranged in double layers in the armature segment stator slot 1. The winding span is 1. An armature segment winding isolation piece 12 is arranged between the two layers of winding.

[0038] In this embodiment, the fault-tolerant segment 1 includes a fault-tolerant segment stator core 7 and a fault-tolerant segment 1 winding isolation member 6. Six fault-tolerant segment stator slots 8 are arranged on the inner circular surface of the fault-tolerant segment stator core 7. Each fault-tolerant segment stator slot 8 corresponds to the position of two armature segment stator slots 1. The winding 3 is arranged in a double layer along the tangential direction in the fault-tolerant segment stator slot 8, and a winding isolation member 6 is arranged between the two layers of windings.

[0039] In this embodiment, the fault-tolerant segment 2 includes a fault-tolerant segment 2 stator core 10 and a fault-tolerant segment 2 winding isolator 9. Six fault-tolerant segment 2 stator slots 11 are arranged on the inner circular surface of the fault-tolerant segment 2 stator core 10. Each fault-tolerant segment 2 stator slot 11 corresponds to the position of two armature segment stator slots 1. The winding 3 is arranged in a double layer tangentially in the fault-tolerant segment 2 stator slot 11, and a winding isolator 9 is arranged between the two layers of windings.

[0040] In this embodiment, each phase winding is composed of two winding coils connected in series, and the total winding flux is composed of the armature segment winding flux, the fault-tolerant segment one winding flux or the fault-tolerant segment two winding flux, wherein the ABC phase winding flux is composed of the armature segment winding flux and the fault-tolerant segment one winding flux, and the UVW phase winding flux is composed of the armature segment winding flux and the fault-tolerant segment two winding flux; when a short-circuit fault occurs in a winding coil of a phase winding, the electrical connection between the faulty phase winding and the controller is disconnected, and the current operating point of the healthy phase is reconstructed according to certain principles, so as to suppress the short-circuit current while taking into account the smooth output of the torque.

[0041] In this embodiment, the fault-tolerant segment stator core 7 includes a yoke 7-1, a tooth top 7-2, a tooth body 7-3 and a slot air gap 7-4 of the fault-tolerant segment stator core. The yoke 7-1 of the fault-tolerant segment stator core is provided with 6 fault-tolerant segment stator slots 8 along the circumferential direction, thereby forming 6 fault-tolerant segment stator teeth. The fault-tolerant segment stator teeth have tooth tops 7-2 and tooth bodies 7-3. The gap between two adjacent fault-tolerant segment stator teeth is a slot air gap 7-4. The stator core 10 of the fault-tolerant segment 2 includes a yoke 10-1, a tooth top 10-2, a tooth body 10-3 and a slot air gap 10-4 of the stator core of the fault-tolerant segment 2. The yoke 10-1 of the stator core of the fault-tolerant segment 2 is provided with 6 stator slots 11 of the fault-tolerant segment 2 along the circumferential direction, thereby forming 6 stator teeth of the fault-tolerant segment 2. The stator teeth of the fault-tolerant segment 2 have tooth tops 10-2 and tooth bodies 10-3, and the gap between two adjacent stator teeth of the fault-tolerant segment 2 is a slot air gap 10-4.

[0042] In this embodiment, the rotor 5 of the armature section includes a rotor core 5-1 and a permanent magnet 5-2, and adopts a surface-mounted magnetic pole structure and a built-in magnetic pole structure. The rotor of the fault-tolerant motor includes a 10-pole and 14-pole structure, and the permanent magnetic flux generated by the rotor magnetic pole has a low harmonic content, and the harmonic content of the no-load back electromotive force is less than 4%.

[0043] In this embodiment, the armature segment inductance matrix is ​​approximately:

[0044]

[0045] in:

[0046]

[0047]

[0048] In the formula, L miaia represents the self-inductance of the winding coil of phase a of armature segment i, M miajb It represents the mutual inductance of the armature segment i-phase winding a coil and the j-phase winding b coil.

[0049] In this embodiment, the fault-tolerant segment-inductance matrix is:

[0050]

[0051] The inductance matrix of fault-tolerant section 2 is:

[0052]

[0053] In the formula, L tiaia represents the self-inductance of the winding coil of phase i of the fault-tolerant section, M tiajb It represents the mutual inductance of the winding coil of phase i winding a and the winding coil of phase j winding b in the fault-tolerant section.

[0054] The mutual inductance M of each part of the fault-tolerant section is the same, all -M t0 , and obtain it by the following formula:

[0055]

[0056] Where b c is the thickness of the first tooth top 7-2 (or the second tooth top 10-2) of the fault tolerance section, l r is the axial length of the fault-tolerant section, N is the number of winding turns, δ r It is the thickness of the slot air gap 7-4 (or the second fault-tolerant section air gap 10-4).

[0057] The following is described in conjunction with a specific embodiment:

[0058] In this embodiment, the basic structure of the motor provided by the present invention is as follows: Figure 2 As shown, its main structure is divided into three sections, namely, fault-tolerant section 1, armature section and fault-tolerant section 2. Its basic structure includes armature section stator core 2, winding 3, shaft 4, rotor 5, fault-tolerant section 1 stator core 7, fault-tolerant section 2 stator core 10.

[0059] In this embodiment, the armature segment winding and the fault-tolerant segment winding are the same winding and are wound in series between the armature segment and a fault-tolerant segment according to the same phase sequence. The ABC phase winding is wound in series between the armature segment and the fault-tolerant segment 1, and the UVW phase winding is wound in series between the armature segment and the fault-tolerant segment 2; the two ends of the winding are respectively located outside the stator core 2 of the armature segment and outside the stator core 7 of the fault-tolerant segment, as shown in FIG. Figure 2 shown.

[0060] In this embodiment, the armature segment is a 12-slot 10-pole semi-twelve-phase stator-rotor structure, including an armature segment stator slot 1, an armature segment stator core 2, a winding 3, a rotating shaft 4, a rotor 5, and an armature segment winding isolation member 12. Figure 3 As shown, the winding is Figure 3 The phase sequence shown in the figure is arranged in the stator slots, the rotor is fixed on the rotating shaft and arranged inside the stator, the rotor includes a rotor core 5-1 and a permanent magnet 5-2, an air gap is left between the rotor and the stator, the armature segment adopts a fractional slot concentrated winding, the winding structure is a double-layer winding, the winding span is 1, an armature segment winding isolation piece is arranged between the 2 layers of windings, and the torque of the motor is generated in the armature segment.

[0061] In this embodiment, the fault-tolerant segment 1 is a 6-slot three-phase stator structure, including a winding 3, a rotating shaft 4, a winding spacer 6, a fault-tolerant segment stator core 7, and a fault-tolerant segment stator slot 8. Figure 4 The fault-tolerant section 2 is a 6-slot three-phase stator structure, including a winding 3, a rotating shaft 4, a winding spacer 9, a stator core 10 of the fault-tolerant section 2, and a stator slot 11 of the fault-tolerant section 2. Figure 5The arrangement order of the windings of the fault-tolerant sections 1 and 2 is consistent with the arrangement order of the windings of the corresponding phases of the armature sections. The fault-tolerant sections 1 and 2 use tangentially distributed double-layer windings. The winding separator 6 (fault-tolerant section 1) and the winding separator 9 (fault-tolerant section 2) are inserted between the two layers of windings in the same slot. The material of the winding separator needs to have magnetic isolation, insulation and thermal insulation properties (such as mica sheets).

[0062] The phase sequence distribution of the winding in the armature segment core and the fault-tolerant segment core is consistent, but the different structures of the armature segment stator core 2 and the fault-tolerant segment stator core 7 make the magnetic circuit structure of one phase winding different in different segments. The armature magnetic field is distributed in the stator core, air gap, permanent magnet and rotor core, and the magnetic field in the air gap is mainly radial magnetic field. Each phase winding has self-inductance and mutual inductance. For fault-tolerant segment one, the magnetic field of fault-tolerant segment one is distributed in the yoke 7-1, tooth top 7-2, tooth body 7-3, and slot air gap 7-4 of the fault-tolerant segment stator core 7; for fault-tolerant segment two, the magnetic field of fault-tolerant segment two is distributed in the yoke 10-1, tooth top 10-2, tooth body 10-3, and slot air gap 10-4 of the stator core 10 of the fault-tolerant segment two. The magnetic field in the air gap is mainly tangential magnetic field. The width of the stator tooth top is widened, and the slot width is narrowed to form an air gap structure. The magnetic circuits of adjacent phase windings are linked to each other through the fault-tolerant section core, which is reflected as mutual inductance in the inductance. The current in the fault-tolerant section generates winding flux through the self-inductance and mutual inductance of the fault-tolerant section. Adjusting the current operating point of the motor can adjust the motor torque in the armature section and adjust the winding flux in the fault-tolerant section, thereby realizing the decoupling of the winding flux and the armature flux.

[0063] The composite structure composed of the fault-tolerant section and the armature section can realize the decoupling of the winding coil flux and the armature magnetic field, and can further realize the decoupling between the winding coil flux and the motor torque output capacity, so that the motor has the ability to achieve both smooth torque output and suppress short-circuit current.

[0064] In this embodiment, the permanent magnet flux generated by the designed rotor poles has a low harmonic content, and the harmonic content of the no-load back electromotive force is less than 4%.

[0065] The fault-tolerant stator core 7 generates phase-to-phase mutual inductance through the stator slot leakage inductance, so it has the characteristics of thick yoke, thick tooth top, and thin slot air gap, that is, the slot leakage inductance is increased as much as possible under the premise of ensuring that the slot area has a certain margin and the slot width meets the offline process, so as to make full use of the magnetic conductivity of the fault-tolerant stator core 7. The mutual inductance of the fault-tolerant section is obtained by the following formula:

[0066]

[0067] Where b c is the thickness of the first tooth top 7-2 (or the second tooth top 10-2) of the fault tolerance section, l r is the axial length of the fault-tolerant section, N is the number of winding turns, δ rIt is the thickness of the slot air gap 7-4 (or the second fault-tolerant section air gap 10-4).

[0068] In order to ensure that the mutual inductance of the fault-tolerant section is increased to obtain better fault-tolerant capability, the thickness of the tooth top 7-2 of the fault-tolerant section one can be increased (the thickness of the slot air gap 7-4 can be reduced). Similarly, for the fault-tolerant section two, the thickness of the tooth top 10-2 of the fault-tolerant section two can be increased (the thickness of the slot air gap 10-4 can be reduced). These two factors are mutually exclusive. The greater the thickness of the tooth top 7-2 of the fault-tolerant section, the smaller the thickness of the slot air gap 7-4. The greater the thickness of the tooth top 10-2 of the fault-tolerant section, the smaller the thickness of the slot air gap 10-4, and the greater the mutual inductance of the fault-tolerant section. The mutual inductance of the fault-tolerant section can also be improved by increasing the number of winding turns and the axial length of the fault-tolerant section.

[0069] The inner and outer diameters of the stator of the armature segment and the first and second fault-tolerant segments can be the same or different, that is, the inner diameter of the stator core 7 of the fault-tolerant segment can be less than or equal to the inner diameter of the stator core 2 of the armature segment and larger than the outer diameter of the rotating shaft 4 of the fault-tolerant segment, or larger than the inner diameter of the stator core 2 of the armature segment and larger than the outer diameter of the rotating shaft 4 of the fault-tolerant segment; the outer diameter of the stator core 7 of the fault-tolerant segment can be larger than the outer diameter of the stator core 2 of the armature segment or smaller than the outer diameter of the stator core 2 of the armature segment. The size of the stator core 10 of the second fault-tolerant segment has the same design principle as the stator core 7 of the fault-tolerant segment.

[0070] Embodiment 2

[0071] Combine the following Figures 1 to 11 This embodiment is described. The fault-tolerant method of the inductance editing type 12-slot half-twelve-phase fault-tolerant motor described in this embodiment is implemented based on the inductance editing type 12-slot half-twelve-phase fault-tolerant motor described in the embodiment. The method described in this embodiment is applicable to the case where a single-phase winding coil is short-circuited, that is, when any one of the winding coils ABCUVW is short-circuited, the method described in this embodiment is used for fault tolerance. The fault-tolerant method is a current reconstruction method of the inductance editing type half-twelve-phase fault-tolerant motor when a single-phase winding short-circuit occurs. According to certain principles, a new current operating point of the remaining healthy winding is reconstructed, and the current operating point satisfies the following conditions: the d-axis and q-axis currents of the armature segment are given DC d-axis and q-axis current values, and the current operating point in the fault-tolerant segment generates a magnetic flux in the short-circuited phase winding through the phase-to-phase mutual inductance and a magnetic flux generated by the permanent magnet in the armature segment to produce a counteracting effect, and finally reduces the total magnetic flux of the short-circuited phase winding, reduces the back electromotive force of the short-circuited phase winding, and reduces the short-circuit current.

[0072] The inductance-edited semi-twelve-phase fault-tolerant motor proposed in the present invention can perform fault-tolerant operation for a fault condition in which a coil of a single-phase winding is short-circuited, that is, it can perform fault-tolerant operation for a short-circuit of a single winding coil of A1, A2, B1, B2, C1, C2, U1, U2, V1, V2, W1, and W2.

[0073] In this embodiment, when a coil of one phase winding of the semi-twelve-phase motor is short-circuited, the motor needs to operate with fault tolerance (taking the short circuit of phase A1 as an example, and the same applies to other phases). Fault tolerance requires that the new current working point can significantly reduce the back electromotive force of the short-circuited phase, while ensuring the smooth output of the torque of the semi-twelve-phase motor. Therefore, the phase current of the semi-twelve-phase motor needs to satisfy the constraint shown in formula (9):

[0074]

[0075] where θ e is the motor electrical angle, i d is the given value of d-axis current, i q is the given value of q-axis current, i1~i5 are the healthy phase winding currents during short circuit, ψ m It is the permanent magnetic flux linkage on the short-circuited winding of the motor. In the permanent magnet motor, this parameter can be regarded as a constant. The relevant variables are selected according to Table 1 and Table 2:

[0076] Combining formula (9) with the conditions in Tables 1 and 2, the reconstructed short-circuit current required for short-circuit fault tolerance of the A1 winding coil can be obtained.

[0077] Table 1 Comparison table of mutual inductance selection parameters under different short-circuit coil conditions in formula (9)

[0078]

[0079] Table 2 Comparison table of mutual inductance selection parameters under different short-circuit coil conditions in formula (9)

[0080]

[0081]

[0082] In the embodiment, Figure 2 , Figure 3 , Figure 4 , Figure 5 A simulation model is built based on the motor structure shown in the figure, and the fault and fault-tolerant conditions of the short circuit at the end of the A1 coil are simulated.

[0083] by Figure 1-Figure 7 The motor is an embodiment, and the armature segment is a semi-twelve-phase stator-rotor structure with 12 slots and 10 poles. In the embodiment, the stator outer diameters of the armature segment and the fault-tolerant segments one and two are both 138 mm, the stator inner diameters are both 54.2 mm, the stator yoke thickness of the fault-tolerant segments one and two is 13.9 mm, the tooth top thickness is 13 mm, the tooth body width is 19.3 mm, the air gap is 1.1 mm, the armature segment axial length is 120 mm, and the axial lengths of the fault-tolerant segments one and two are both 40 mm.

[0084] Each slot has 7 turns of winding, and the armature segment self-inductance is L m00.11mH, fault-tolerant mutual inductance M m0 is 0.019mH, the permanent magnetic flux of each winding Ψ f It is 0.00096WB, and the motor operates at the operating point of d-axis current -51A and q-axis current 71.4A.

[0085] In the simulation results of the embodiment, the physical quantities such as the working current of the healthy phase, the back electromotive force of the short-circuited phase, the current and the electromagnetic torque of the motor are as follows: Figure 8 , Fig. 9 , Fig.10 , Fig.11 The results show that when the A1 phase winding coil is short-circuited, the short-circuit reverse potential is greatly reduced and the short-circuit current is greatly suppressed when the inductance editing type semi-twelve-phase fault-tolerant motor proposed by the present invention adopts the fault-tolerant method proposed by the present invention. The short-circuit current amplitude after fault tolerance is 6.6% of the fault-tolerant value after short circuit. The average torque after fault tolerance is improved compared with the non-fault-tolerant state and restored to the level before fault. The torque fluctuation after fault tolerance is suppressed and the torque fluctuation is 4.8% of the non-fault-tolerant value after fault.

[0086] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An inductance editing type 12-slot half-twelve-phase fault-tolerant motor, characterized in that: include: Winding (3), rotating shaft (4), fault-tolerant section 1, armature section and fault-tolerant section 2 distributed along the axial direction; The armature section is a semi-twelve-phase stator-rotor motor unit, and the fault-tolerant section is a three-phase stator motor unit; all motor units share a rotating shaft (4), and a set of windings (3) are simultaneously wound on the stators of the armature section and the fault-tolerant section; wherein the ABC phase windings are wound in series on the armature section and the first fault-tolerant section, and the UVW phase windings are wound in series on the armature section and the second fault-tolerant section; The armature segment comprises: an armature segment stator core (2) and a rotor (5); a radial air gap exists between the armature segment stator core (2) and the rotor (5); 12 armature segment stator slots (1) are arranged on the inner circumferential surface of the armature segment stator core (2); two layers of windings of each phase are arranged in the armature segment stator slots (1); the winding span is 1; and an armature segment winding spacer (12) is arranged between the two layers of windings; The fault-tolerant segment 1 comprises: a fault-tolerant segment stator core (7) and a fault-tolerant segment 1 winding isolator (6); six fault-tolerant segment stator slots (8) are arranged on the inner circumferential surface of the fault-tolerant segment stator core (7); each fault-tolerant segment stator slot (8) corresponds to the position of two armature segment stator slots (1); the winding (3) is arranged in two layers along the tangential direction in the fault-tolerant segment stator slots (8); a fault-tolerant segment 1 winding isolator (6) is arranged between the two layers of windings; The fault-tolerant segment stator core (7) comprises: a yoke (7-1), a tooth top (7-2), a tooth body (7-3) and a slot air gap (7-4) of the fault-tolerant segment stator core; the yoke (7-1) of the fault-tolerant segment stator core is provided with six fault-tolerant segment stator slots (8) along the circumferential direction, thereby forming six fault-tolerant segment stator teeth; the fault-tolerant segment stator teeth have tooth tops (7-2) and tooth bodies (7-3); and the gap between two adjacent fault-tolerant segment stator teeth is a slot air gap (7-4); The fault-tolerant section 2 comprises: a fault-tolerant section 2 stator core (10) and a fault-tolerant section 2 winding isolator (9); six fault-tolerant section 2 stator slots (11) are arranged on the inner circumferential surface of the fault-tolerant section 2 stator core (10); each fault-tolerant section 2 stator slot (11) corresponds to the position of two armature section stator slots (1); the winding (3) is arranged in two layers along the tangential direction in the fault-tolerant section 2 stator slots (11); and a fault-tolerant section 2 winding isolator (9) is arranged between the two layers of windings; The fault-tolerant segment two stator core (10) comprises: a yoke (10-1), a tooth top (10-2), a tooth body (10-3) and a slot air gap (10-4) of the fault-tolerant segment two stator core; the yoke (10-1) of the fault-tolerant segment two stator core is provided with six fault-tolerant segment two stator slots (11) along the circumferential direction, thereby forming six fault-tolerant segment two stator teeth; the fault-tolerant segment two stator teeth have tooth tops (10-2) and tooth bodies (10-3); and the gap between two adjacent fault-tolerant segment two stator teeth is a slot air gap (10-4).

2. The inductance edited 12-slot half-twelve-phase fault-tolerant motor according to claim 1, characterized in that: The rotor (5) comprises a rotor core (5-1) and a permanent magnet (5-2), and adopts a surface-mounted magnetic pole structure.

3. The inductance editable 12-slot half-twelve-phase fault-tolerant motor according to claim 1, characterized in that: The rotor (5) of the fault-tolerant motor comprises a 10-pole structure and the permanent magnetic flux generated by the rotor magnetic poles has a low harmonic content, and the harmonic content of the no-load back electromotive force is less than 4%.

4. A fault-tolerant method for an inductance-edited 12-slot semi-twelve-phase fault-tolerant motor is implemented based on the inductance-edited 12-slot semi-twelve-phase fault-tolerant motor according to any one of claims 1 to 3, characterized in that: The following steps are involved: When a short-circuit fault occurs in the k-th winding coil of the i-phase winding of the motor, the healthy phase current is reconstructed according to the preset principle to perform short-circuit fault tolerance.

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